I'd say the majority of people here have/are using pulseaudio, don't pay attention to my aversion.
There have been several threads on enabling the pulseaudio service (pulseaudio-66serv pkg) and it may require a reboot or restart of session to work. I can't remember what the plasma default installation services are:
% 66-intree -zg
% sudo 66-intree -zg
you get the output of your user and then the root level services.
Before you get too deep into 66 reading the most important parts are
66-tree (how you - create, remove, enable, disable, prioritize enabled, - trees)
66-enable/66-disable (services, modules, and module-type of services in trees)
66-intree (see what yours trees have on them)
66-inservice (see what the setup and log are for a particular svc/daemon/module)
66-all (en/dis/able a tree)
66-start/stop a particular service/module
If you like playing with VMs do an installation and keep playing with trees and services till you get a feel for how it works. Once you pass the early stage I doubt you would choose any other inferior system instead.